mechanical mechanismshttps://mechamechanisms.com/Sat, 06 Jun 2020 19:30:00 +0200Zigzag Translationhttps://mechamechanisms.com/zigzag-translation-2<p>Blue slider translates along a zigzag line.<br>
Center distance of two red pins is equal to the zigzag slot pitch.</p>Sat, 06 Jun 2020 19:30:00 +0200tag:mechamechanisms.com,2020-06-06:zigzag-translation-2Internal Gear Slider Mechanismhttps://mechamechanisms.com/internal-gear-slider-mechanism-4<p>The yellow gear (radius r2 = 30) is fixed to the connecting rod.<br>
The green gear (radius r1 = 60) is not fixed to the pink input crank.<br>
Crank length: R = 60<br>
Connecting rod length: L = 70<br>
(r1 longer than L &ndash; R)<br>
The green output gear irregularly rotates (with going back) 2 revolutions when the pink crank rotates 1 revolution in the opposite direction.</p>Thu, 04 Jun 2020 19:36:00 +0200tag:mechamechanisms.com,2020-06-04:internal-gear-slider-mechanism-4Cable Drivehttps://mechamechanisms.com/cable-drive-26<p>Converting continuous rotation of the pink gear crank to reciprocating translation of the red slider.<br>
The red slider and the pink slider are fixed to the cable.<br>
The blue wheels and the green pulleys rotate idly on axles of the yellow bar.<br>
The red slider receives two motions:<br>
- From the orange crank slider mechanism.<br>
- From the pink crank slider mechanism and cable drive.</p>Wed, 03 Jun 2020 19:30:00 +0200tag:mechamechanisms.com,2020-06-03:cable-drive-26Grabberhttps://mechamechanisms.com/grabber-2<p>Pull pink rod to grab an object.<br>
This grabber can be considered as an application of slider crank mechanism of flexible links.<br>
Slider: pink rod.<br>
Cranks: blue bars.<br>
Connection rods: green bars</p>Tue, 02 Jun 2020 19:30:00 +0200tag:mechamechanisms.com,2020-06-02:grabber-2Pipe Truckhttps://mechamechanisms.com/pipe-truck-1<p>Blue and pink links create a parallelogram mechanism.<br>
Orange cylinder turns the grey pipe 90 deg.<br>
Violet cylinder translates the pipe.<br>
Violet cylinder is of a double acting telescopic cylinder to increase motion range.<br>
Pipe clamping device is not shown.</p>Mon, 01 Jun 2020 19:30:00 +0200tag:mechamechanisms.com,2020-06-01:pipe-truck-1Translating Cam Mechanismhttps://mechamechanisms.com/translating-cam-mechanism-4<p>W8a.avi Uploaded on 13/03/2013<br>
<br>
If the cam pitch line is a symmetric zigzag, a rhomb-shaped pin can be used for the cam and follower contact to increase load capacity.</p>Sun, 31 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-31:translating-cam-mechanism-4Cable Drive for Changing Direction of Linear Motionhttps://mechamechanisms.com/cable-drive-for-changing-direction-of-linear-motion-3<p>Input: violet slider moving along a stationary runway thanks to grey cylinder.<br>
Ouput: pink slider moving along a green rotary runway.<br>
Axis of the cable vertical portion and axis of revolution joint of the movable runway are coaxial.<br>
The cable twist does not affect motion transmission which can be performed even during the green runway rotation.<br>
Rotation of the green runway is controlled by a motor (not shown) through the green gear.<br>
The mechanism can be used for controlling planar motion of a point that belongs to the pink slider based on the polar coordination system..</p>Sat, 30 May 2020 19:35:00 +0200tag:mechamechanisms.com,2020-05-30:cable-drive-for-changing-direction-of-linear-motion-3Machine Tool Fixturehttps://mechamechanisms.com/machine-tool-fixture-15<p>The pink lever can move back to clear space for removing the yellow workpiece. The clamping head&rsquo;s position can be adjusted by the red screw.</p>Fri, 29 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-29:machine-tool-fixture-15Helix Torus Jointhttps://mechamechanisms.com/helix-torus-joint-2<p>The orange torus can turns around its own axis. It has also a helical motion around axis of the green spring-shaped part. So this joint has two degrees of freedom.</p>Thu, 28 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-28:helix-torus-joint-2Belt Drivehttps://mechamechanisms.com/belt-drive-8<p>Rotation transmission between parallel shafts, one can move.<br>
The key factor is: 4 belt branches connecting to the green and blue pulleys must be parallel.<br>
It uses rope and flat belts, not V-belts.</p>Wed, 27 May 2020 19:35:00 +0200tag:mechamechanisms.com,2020-05-27:belt-drive-8Inclining Disk Mechanismhttps://mechamechanisms.com/inclining-disk-mechanism-2<p>Application for engines. Flat contact with added spherical joints.</p>Tue, 26 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-26:inclining-disk-mechanism-2Machine Tool Fixturehttps://mechamechanisms.com/machine-tool-fixture-55<p>Turn blue lever to clamp or release yellow workpiece.<br>
Pink floating cam ensures the equalizing clamp of two green jaws for the workpiece.<br>
Note: the cam can slide on blue shaft in the radial direction.</p>Mon, 25 May 2020 19:47:00 +0200tag:mechamechanisms.com,2020-05-25:machine-tool-fixture-55Altering Speed With Oldham Mechanismhttps://mechamechanisms.com/altering-speed-with-oldham-mechanism-1<p>If the green gear is driving, the two output shafts speed is half of the green gear one.is used for this case.</p>Sun, 24 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-24:altering-speed-with-oldham-mechanism-1Folding Chairhttps://mechamechanisms.com/folding-chair-2<p>It is an application of 4 bar linkage.<br>
If green rear legs are considered as a stationary link so pink link and blue seat are the rockers; yellow front leg link is the connecting rod.</p>Sat, 23 May 2020 19:36:00 +0200tag:mechamechanisms.com,2020-05-23:folding-chair-2Wobbling Pin Gear Mechanismhttps://mechamechanisms.com/wobbling-pin-gear-mechanism-1<p>Input: pink shaft having an inclined portion.<br>
Output: blue gear of tooth number Zb.<br>
Green pin gear (pin number Zgn) has revolute joint with the inclined portion of the pink shaft. It performs wobbling motion.<br>
Zgn is larger than Zb.<br>
Grey gear (tooth number Zgy) is stationary. It keeps the green gear from rotating because Zgy = Zgn.<br>
Output velocity is regular.<br>
Rotary directions of the input and output are opposite.<br>
Transmission ratio i = (Zgn – Zb) / Zb<br>
Here:<br>
Zb = 38 ; Zgn = Zgy = 40 ; i = 1/19.<br>
This mechanism is called “Nutation drive” in “Mechanisms And Mechanical Devices Sourcebook”, Sclater &amp; Chironis, 2001, page 244.</p>Fri, 22 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-22:wobbling-pin-gear-mechanism-1Gear-Rack Drivehttps://mechamechanisms.com/gear-rack-drive<p>Green bracket and blue cylinder are pivoted on the base.<br>
Gray roller bears radial member of gear force.<br>
This design avoids making long runway, ensures easy assembly and reduces friction.</p>Thu, 21 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-21:gear-rack-driveDiaphragm Shutterhttps://mechamechanisms.com/diaphragm-shutter-1<p>Turn outer disk to open or close the aperture of a camera.<br>
The outter disk, yellow conrod and blue blade create a 4-bar mechanism.</p>Wed, 20 May 2020 19:59:00 +0200tag:mechamechanisms.com,2020-05-20:diaphragm-shutter-1Liquid Dispenserhttps://mechamechanisms.com/liquid-dispenser-1<p>Liquid from the ovan tank flows to two meter containers and then to the grey bottle alternately subject to handle positions of the blue four port valve.<br>
The principle of communicating vessels is applied here.<br>
No electricity is required.<br>
Volume error depends on the oscilation of liquid level in the oval tank and the inside diameter (should be minimum) of the air pipes of the meter containers.</p>Tue, 19 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-19:liquid-dispenser-1Mechanical Odometerhttps://mechamechanisms.com/mechanical-odometer-1<p>Input: pink pinion that makes violet pin gear rotate continuously.<br>
One revolution of the violet gear makes the next blue pin gear rotate interruptedly one tenth of a revolution thanks to two pins on the left side of the violet gear and the first orange gear of 8 teeth. Four teeth of the orange gear are longer than the remainings. In combination with the outside diameter of the violet gear they keep the orange gear and the blue gear immobile when the above mentioned two pins are not in mesh.<br>
The same process is applied to the motion transmission between the bue and green gears.<br>
The video shows how the odometer works when the violet gear rotates from the 07th to the 13th revolution.</p>Mon, 18 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-18:mechanical-odometer-1Slider-Crank Mechanism of Snap Motionhttps://mechamechanisms.com/slider-crank-mechanism-of-snap-motion<p>Input: pink crank.<br>
Green disk is idly mounted on the pink crank.<br>
The interaction between two orange pins fixed to the crank and two slots of the disk under pulling force of red spring causes the snap action.<br></p>Sun, 17 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-17:slider-crank-mechanism-of-snap-motionExternal Gear Drive of Adjustable Shaft Anglehttps://mechamechanisms.com/external-gear-drive-of-adjustable-shaft-angle<p>Yellow gear is of regular spur one.<br>
Teeth of green gear is combination of spur and face ones.<br>
They are cut on a gear shaping machine that can vary angle between workpiece and cutter axes during cutting</p>Sat, 16 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-16:external-gear-drive-of-adjustable-shaft-angleFeederhttps://mechamechanisms.com/feeder-1<p>Workpieces (yellow and pink) are fed one by one.<br>
Blue pushing bar is driven by a sine mechanism.</p>Thu, 14 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-14:feeder-1Polar Planimeterhttps://mechamechanisms.com/polar-planimeter-1<p>Instrument for determining the area (F) of an arbitrary two-dimensional shape (in red).<br>
Move stylus B along the periphery of the shape (one complete round), the green roller gives two values:<br>
B1: initial position angle (in radians)<br>
B2: final position angle (in radians)<br>
F = L.R.(B1-B2)<br>
L = BC<br>
R: radius of rolling circle of the green roller.<br>
The roller rotation axis must be parallel to BC.<br>
Mathematical basis of the mechanism: intergration in polar coordinates.<br>
There must be sufficient friction between the green roller and the ground to prevent slipping.<br>
In real planimeters there is reduction gear drive to ease reading angle values.</p>Wed, 13 May 2020 19:35:00 +0200tag:mechamechanisms.com,2020-05-13:polar-planimeter-1Wood Hand Screw Drillhttps://mechamechanisms.com/wood-hand-screw-drill<p>Press on the button, move the green grip up and down to rotate the red bit.</p>Tue, 12 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-12:wood-hand-screw-drillSlider-Crank Mechanismhttps://mechamechanisms.com/slider-crank-mechanism-4<p>Blue conrod is inside green slider.<br>
The conrod-slider revolute joint is on the right.<br>
The conrod-slider contact on the left is for form closing of the said joint.</p>Mon, 11 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-11:slider-crank-mechanism-4Spring Toggle Mechanismhttps://mechamechanisms.com/spring-toggle-mechanism-2<p>Toggle action here ensures that the gear shift lever (violet) will not inadvertently be thrown past its neutral position.<br>
The pink pins are stoppers for the violet lever.<br>
The yellow double crank represents manual action.</p>Sun, 10 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-10:spring-toggle-mechanism-2Car Sliding Doorhttps://mechamechanisms.com/car-sliding-door-1<p>This ensures synchronic motions of yellow door and pink step.<br>
When the door opens, the step moves out and vice versa.<br>
The mechanism consists of two slider crank mechanisms of a common crank (in orange).</p>Sat, 09 May 2020 19:35:00 +0200tag:mechamechanisms.com,2020-05-09:car-sliding-door-1Face Gearhttps://mechamechanisms.com/face-gear-5<p>Face gear drive allows to adjust axial distance between the rollers.<br>
The rollers rotate in the same direction. Their speeds can be different if tooth numbers of the two face gears are diferent.</p>Fri, 08 May 2020 19:46:00 +0200tag:mechamechanisms.com,2020-05-08:face-gear-5Rotation When Get Prescribed Speed Onlyhttps://mechamechanisms.com/rotation-when-get-prescribed-speed-only<p>Input: green shaft.<br>
Output: yellow shaft. It rotates only when the input rotates at prescribed speed V. Here the output speed = V/2<br>
Brown semi-clutch of friction cone under pressure of blue spring makes pink gear rotate.<br>
Centrifugal governor of two violet balls makes orange slider go up-down subject to the input speed. The governor is set in such a way that at prescribed input speed V the cam of orange slider does not contact blue angular arms and the brown semi-clutch can transmit motion to output shaft via pink gear. When the input speed is larger or smaller than V, the cam turns the blue angular arms to pull the brown semi-clutch from contact with the pink gear and the output shaft stops.<br>
The video was made following a request from a YouTube viewer.</p>Thu, 07 May 2020 19:36:00 +0200tag:mechamechanisms.com,2020-05-07:rotation-when-get-prescribed-speed-onlyMechanism for Drawing Circlehttps://mechamechanisms.com/mechanism-for-drawing-circle-5<p>Pink, blue and yellow bars create a parallelogram mechanism.<br>
Pen E draws orange circle of center O.<br>
This avoids the need to arrange a pivot at the circle center.<br>
Triangles OAD and EBC are equal.<br>
If the pink crank rotates regularly, the pen moves regularly on the circle.<br>
The mechanism has dead positions when all bars are in line.</p>Wed, 06 May 2020 19:42:00 +0200tag:mechamechanisms.com,2020-05-06:mechanism-for-drawing-circle-5Semi-Spherical Gearshttps://mechamechanisms.com/semi-spherical-gears-2<p>Input: pink gear.<br>
Output: green gear.<br>
This is a constant velocity joint.<br>
Spatial angle between the input and output shafts in any plane that contains the pink gear axis can be adjusted by turning the violet and yellow links.</p>Tue, 05 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-05:semi-spherical-gears-2Friction One-Way Linear Clutchhttps://mechamechanisms.com/friction-one-way-linear-clutch-1<p>Pull blue table to bring it higher.<br>
At the pause position of the table, the pink latch is slanting to the table post. The table can move only in direction that tends to make the latch more slanting i.e. the up direction.<br>
For moving in the down direction press the latch outer end to separate the latch from the table post, the table falls down by its weight.</p>Mon, 04 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-04:friction-one-way-linear-clutch-1Universal Joint of Linkshttps://mechamechanisms.com/universal-joint-of-6-links-1<p>It is used for rotation transmission between the shafts, relative position of which in space is arbitrary.<br>
The video shows case when input orange shaft and output blue shaft are skew.<br>
In general it is not a constant velocity joint except the case when the shafts are in line.</p>Sun, 03 May 2020 19:47:00 +0200tag:mechamechanisms.com,2020-05-03:universal-joint-of-6-links-1Spherical Slider-Crank Mechanismhttps://mechamechanisms.com/spherical-slider-crank-mechanism-1a<p>Input: pink crank.<br>
Output: orange slider reciprocating along yellow stationary circular runway. Center O of glass sphere lies on axis of the said runway.<br>
Axes of three revolution joints intersect each other at point O.</p>Sat, 02 May 2020 19:36:00 +0200tag:mechamechanisms.com,2020-05-02:spherical-slider-crank-mechanism-1aInverse Parallelogram Mechanismhttps://mechamechanisms.com/inverse-parallelogram-mechanism-3<p>The concave curves on the yellow fixed bar and the pin on the cyan rod are for overcoming dead points.</p>Fri, 01 May 2020 19:30:00 +0200tag:mechamechanisms.com,2020-05-01:inverse-parallelogram-mechanism-3Linear Snap Motionhttps://mechamechanisms.com/linear-snap-motion-1<p>Input: green slider linearly reciprocating.<br>
Output: blue slider linearly reciprocating with snap motion and dwell at one end of its stroke.<br></p>Thu, 30 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-30:linear-snap-motion-1Shifting Gear Mechanismhttps://mechamechanisms.com/shifting-gear-mechanism-3<p>Input: green shaft carrying three gears.<br>
Output: pink hollow shaft in which orange shaft slides. The pink and orange shafts rotate together owing cyan key, that has a revolution joint with the orange shaft.<br>
Red, yellow and blue gears engage with the green gears and idly rotates (with different speeds) on the pink shaft.<br>
Depending to axial position of the orange shaft which is controlled by violet crank, the cyan key enters into key slots of one of the red, yellow and blue gears and connects it with the pink output shaft. Red pins help retreave the cyan key from the gear key slots when the orange shaft moves longitudinally.<br>
There is a flat spring (not shown) that forces the cyan key towards the gears.<br>
The video shows 3 positions of the orange shaft that give 3 output speeds.</p>Wed, 29 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-29:shifting-gear-mechanism-3Table Lift Mechanismhttps://mechamechanisms.com/table-lift-mechanism-1<p>Blue rockers and green bars form parallelogram mechanisms.<br>
Blue springs create forces for keeping the table firmly at highest position. Use stronger force for lowering the table.<br>
This video was made based on:<br>
/watch?v=wCpm5zBwYAc<br></p>Tue, 28 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-28:table-lift-mechanism-1Globoid Worm and Pin Drivehttps://mechamechanisms.com/globoid-worm-and-pin-drive<p>It is used in car steering system. The worm is connected to a steering wheel. The rotary pin reduces friction at contact place. A globoid worm gives better performance than ordinary one.</p>Mon, 27 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-27:globoid-worm-and-pin-driveKite Mechanismhttps://mechamechanisms.com/kite-mechanism-3-2<p>A development of kite mechanism by adding a coulisse mechanism.<br>
When the red link makes one revolution, the blue makes two.<br>
Both rotate regularly.<br>
The measure to overcome dead positions is not shown.</p>Sun, 26 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-26:kite-mechanism-3-2Transmission Through Closed Wall With Bar Mechanismhttps://mechamechanisms.com/transmission-through-closed-wall-with-bar-mechanism<p>Input: orange shaft having an oblique (15 deg.) pivot and rotating regularly.<br>
Output: blue shaft rotating regularly. Transmission ratio: 1.<br>
Grey disk has revolute joint with the orange shaft and spherical joint with the blue shaft.<br>
Purpose of 3 pins (in glass) is to show that the grey disk can be kept not to rotate together with the orange shaft. So it is possible to put a flexible tube connecting the grey disk and the glass wall thus to perform the transmission through closed wall on which the right bearing is fixed (see the sketch).</p>Sat, 25 Apr 2020 19:35:00 +0200tag:mechamechanisms.com,2020-04-25:transmission-through-closed-wall-with-bar-mechanismTransmission Between Intersecting Shaftshttps://mechamechanisms.com/transmission-between-intersecting-shafts-2<p>Rotary directions are opposite.<br>
Both shafts rotate regularly.</p>Fri, 24 Apr 2020 19:52:00 +0200tag:mechamechanisms.com,2020-04-24:transmission-between-intersecting-shafts-2Pin Gear Drivehttps://mechamechanisms.com/pin-gear-drive-1d<p>Transmission ratio i = 2/22</p>Thu, 23 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-23:pin-gear-drive-1dDisk Cam Mechanismhttps://mechamechanisms.com/disk-cam-mechanism-df5<p>Adjust rollers distance to alter dwell time of the follower.<br>
Gravity maintains permanent contact between rollers and cam.</p>Wed, 22 Apr 2020 19:35:00 +0200tag:mechamechanisms.com,2020-04-22:disk-cam-mechanism-df5Mechanical Torus Jointhttps://mechamechanisms.com/mechanical-torus-joint-2<p>The joint allows two degrees of freedom (rotations) of relative movement.</p>Tue, 21 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-21:mechanical-torus-joint-2Wrapping Machine for Bar Productshttps://mechamechanisms.com/wrapping-machine-for-bar-products<p>Blue bar is wrapped with green foil.<br>
Input: orange pulley of grey motor. Three yellow rollers receive motion via black belt.<br>
Violet ring carrying a foil coil rotates on orange, yellow and grey rollers (friction drives).<br>
The bar moves longitudinally thanks to brown rollers. The transmission for them is not shown.</p>Mon, 20 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-20:wrapping-machine-for-bar-productsSelf-Centering Fixturehttps://mechamechanisms.com/self-centering-fixture-2a<p>Two symmetric face cams center the yellow workpiece along longitudinal direction.</p>Sun, 19 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-19:self-centering-fixture-2aCam of Two Followershttps://mechamechanisms.com/cam-of-two-followers-2<p>Input: pink cam (Reuleaux triangle) (cam of constant width).<br>
The blue follower linearly reciprocates with dwells at both stroke ends.<br>
The yellow follower has planar motion. Each point on it traces a square (in green). The square side = R2 – R1<br>
R1, R2 are radii of the Reuleaux triangle.</p>Sat, 18 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-18:cam-of-two-followers-2Chain Drivehttps://mechamechanisms.com/chain-drive-5e<p>Satellite chain drive.<br>
The popcorn sprocket is fixed. The popcorn and yellow sprockets have the same tooth number. The pink bar has a revolution joint with the yellow sprocket at its center.<br>
The grey crank and gear is driving.<br>
Locus of center of the revolution joint between blue and pink bars is complicated.</p>Fri, 17 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-17:chain-drive-5eCam and Gear Mechanismhttps://mechamechanisms.com/cam-and-gear-mechanism-7<p>The yellow follower contacts with the orange cam fixed on the orange gear, eccentric portion of the green gear and the fixed lower pin. The cam is of constant width shape. A point of the frame follower traces the red curve that is used for moving film in cameras. Transmission ratio of the gear drive is 1.</p>Thu, 16 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-16:cam-and-gear-mechanism-7Slider Lockhttps://mechamechanisms.com/slider-lock-7<p>Push blue button (using thumb) and pull green part (using two fingers) to unlock yellow slider and move it to new position.<br>
Release the blue button and the yellow part to lock the slider.<br>
Red spring creates friction force for locking.</p>Wed, 15 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-15:slider-lock-7Fan Swinging Devicehttps://mechamechanisms.com/fan-swinging-device<p>A 4-bar linkage is used for fan swinging. The input link is the yellow connecting rod. The pink bar and the rotor house place the role of rockers.<br>
For easy observation the transmission ratio is chosen less than in reality.</p>Tue, 14 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-14:fan-swinging-deviceNut-Screw and Bar Mechanismshttps://mechamechanisms.com/nut-screw-and-bar-mechanisms-7<p>Belt tensioner.</p>Mon, 13 Apr 2020 19:41:00 +0200tag:mechamechanisms.com,2020-04-13:nut-screw-and-bar-mechanisms-7Loading Device of Tea Rolling Machinehttps://mechamechanisms.com/loading-device-of-tea-rolling-machine<p>Pink nut of green screw has a rectangular pin that moves in L-shaped slot of the brown vertical tube.<br>
Green screw is fixed to the green bevel gear.<br>
Rotate orange gear counterclockwise to move blue arm up and to turn it aside for loading material into the large cylinder.<br>
Do inversely for pressing down the material.<br>
Blue arm can move vertically only when the nut pin is in vertical portion of the L-shaped slot.<br>
Blue arm can move horizontally only when the nut pin is in horizontal portion of the L-shaped slot.</p>Sun, 12 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-12:loading-device-of-tea-rolling-machineCam and Gear Mechanismhttps://mechamechanisms.com/cam-and-gear-mechanism-6<p>Input is the yellow shaft having a gear and a disk. The cyan slider (a cam) reciprocates in a slot on the disk due to the red cam that fixed to the red gear. The red gear receives motion from the yellow gear through the blue and the green gears. The orange slider&rsquo;s roller can contact with the yellow disk and the cyan slider. Motion of the orange output slider depends on the cam&rsquo;s shape, its angle position on the red gear and the transmission ratio (= 4 for this case) of the 4-gear drive.</p>Sat, 11 Apr 2020 19:47:00 +0200tag:mechamechanisms.com,2020-04-11:cam-and-gear-mechanism-6Planetary Rotationhttps://mechamechanisms.com/planetary-rotation-3<p>Input: pink crank.<br>
Output: yellow square, velocity of which is double of the input one.<br>
The video shows that 90 deg. input oscillation gives 180 deg. output oscillation.but consists only of bars and revolution joints (no gears).<br>
The square is fixed to yellow crank.where the part dimensions can be got.</p>Fri, 10 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-10:planetary-rotation-3Round Adjustable Duct Elbowhttps://mechamechanisms.com/round-adjustable-duct-elbow-1<p>The duct elbow consists of two parts.<br>
Angle between oblique face and longitudinal axis of each part is<br>
B.<br>
Angle A between axes of two parts is adjustable.<br>
Turn the right part 180 deg. to get max A = 2B.<br>
At the connection place, pipe section is an ellipse that reduces flow area. The less angle B is, the more flow area is.<br>
So the elbow with more parts (3, 4, …) is recommended.</p>Thu, 09 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-09:round-adjustable-duct-elbow-1Cabinet Doorhttps://mechamechanisms.com/cabinet-door<p>Pull glass door to open or close.<br>
The door slides on its hinge to reduce occupation space at open position.<br>
Red spring holds the door steadily at its opening or closing position.<br>
It can be applied for garage doors.</p>Wed, 08 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-08:cabinet-doorEight-Bar Linkage for Translation Along Straight Linehttps://mechamechanisms.com/eight-bar-linkage-for-translation-along-straight-line<p>Input: one of the bars pivoted on the base.<br>
Length of the grey base bar and end bar: a<br>
Length of blue bar: a<br>
Length of green bars: 0.4a + 0.6a<br>
Length of orange bars: 0.4a<br>
Output: the grey end bar that translates along an approximately straight line (is kept always parallel to the base).<br>
The gravity tends to keep the mechanism at stretching position.</p>Tue, 07 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-07:eight-bar-linkage-for-translation-along-straight-lineSelf-Centering Chuck of Six Clamping Pointshttps://mechamechanisms.com/self-centering-chuck-of-six-clamping-points<p>A jaw lever (in pink) is pivoted on each green slider. Thus, the orange work (a stepped shaft) can be well centered and firmly clamped through six points.</p>Mon, 06 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-06:self-centering-chuck-of-six-clamping-pointsFriction Torque Measuringhttps://mechamechanisms.com/friction-torque-measuring<p>A simple method to measure friction torque M generated in revolution joint of the grey inner ring and the orange outer one. The grey ring is fixed on the blue shaft, the orange ring is fixed on the green hand assembly.<br>
M = PLsinα<br>
P: weight of the pink weight<br>
L: distance from the pink weight to the rotation axis<br>
α: angle shown by the green hand<br>
Force applied to the revolution joint is the weight of the hand assembly including the pink weight.<br>
The hand assembly (without the pink weight) must be adjusted with the violet nuts to be in static balance.</p>Sun, 05 Apr 2020 19:35:00 +0200tag:mechamechanisms.com,2020-04-05:friction-torque-measuringFlywheel Speed Amplifierhttps://mechamechanisms.com/flywheel-speed-amplifier-2<p>Input: yellow engine piston.<br>
The linkage causes the flywheel (in orange) to make two revolutions for each double-stroke of the engine piston. Thus, thanks to high speed the flywheel size can be decreased.<br>
Key factor: there is a dead position when red, green, blue and orange links are in line. Inertia helps the mechanism overcome such position.<br>
Source: US patent 2295, October 11, 1841.<br></p>Sat, 04 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-04:flywheel-speed-amplifier-2Disk Cam Mechanismhttps://mechamechanisms.com/disk-cam-mechanism-dr1a<p>The cam consists of two parts: blue round disk and yellow cam.<br>
Green follower moves one time during two revolutions of the cam.<br>
The weight forces the follower toward the cam. Spring force is another possible way. There must be sufficient friction between the yellow cam and the blue pin to avoid accidental motion of the yellow cam.by the introduction of a Youtube user, TheWindGinProject.</p>Fri, 03 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-03:disk-cam-mechanism-dr1aWire Rope Clamphttps://mechamechanisms.com/wire-rope-clamp-5Thu, 02 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-02:wire-rope-clamp-5Loci in Epicyclic Gearinghttps://mechamechanisms.com/loci-in-epicyclic-gearing-a3b<p>Two identical hypocycloid mechanisms guide the point of the blue bar along the triangularly shaped path.<br>
Distance between the bar holes is equal to distance between the two fixed bearings of the pink cranks.<br>
R: pitch diameter of the fixed sun gear<br>
r: pitch diameter of the planetary gear<br>
k = R/r = 3<br>
Distance between the pin axis and the gear axis of the planetary gear is (1/2)r for getting a triangle of straight sides.<br>
The mechanism are useful where space is limited in the area where the curve must be described. The mechanism can be designed to produce other curve shapes.</p>Wed, 01 Apr 2020 19:30:00 +0200tag:mechamechanisms.com,2020-04-01:loci-in-epicyclic-gearing-a3bFour Bar Linkagehttps://mechamechanisms.com/four-bar-linkage-8a<p>A special case of the 4-bar linkage.<br>
Input: pink crank<br>
Output: green crank.<br>
The unusualness: a working cycle of the mechanism corresponds 2 revolutions of the input. Output oscillating angle is larger than 180 deg., a thing that is hard to get by using an ordinary 4-bar linkage. It happens because:<br>
1. The sum of the lengths of the two adjacent links is equal to the sum of the lengths of the other two links.<br>
A + B = C + D<br>
A: length of pink crank (=10)<br>
B: length of yellow conrod (=40)<br>
C: length of green crank (=20)<br>
D: distance between fixed axes of pink and green cranks (=30)<br>
2. There are measures to overcome dead position (when green crank and yellow conrod are in line). For example, inertia of the green crank must be big enough.</p>Tue, 31 Mar 2020 19:35:00 +0200tag:mechamechanisms.com,2020-03-31:four-bar-linkage-8aStudy of Spatial Parallelogram Mechanismhttps://mechamechanisms.com/study-of-spatial-parallelogram-mechanism-2a<p>Lower and upper regular triangle plates are identical.<br>
Green vertical bars are identical.<br>
All joints are spherical.<br>
When the upper plate moves, it may not be parallel to the lower plate.<br>
Computer testing shows that the mechanism has 3 degrees of freedom (DoF) excluding passive DoF (rotation of each bar around the line joining its two joints).</p>Mon, 30 Mar 2020 19:30:00 +0200tag:mechamechanisms.com,2020-03-30:study-of-spatial-parallelogram-mechanism-2aMechanism for Drawing Intersection of Cylinder and Planehttps://mechamechanisms.com/mechanism-for-drawing-intersection-of-cylinder-and-plane-1<p>Input: green crank.<br>
Point of blue bar draws intersection (orange ellipse) of yellow cylinder and a plane. The plane is parallel to the one that contains two axes (vertical and horizontal) of pink slider.<br>
Cylinder axis and rotary axis of the green crank are parallel.<br>
Radius of the green crank and radius of the yellow cylinder are equal.<br>
Adjust tilt angle of the brown bearing to get various intersections.</p>Sun, 29 Mar 2020 19:35:00 +0200tag:mechamechanisms.com,2020-03-29:mechanism-for-drawing-intersection-of-cylinder-and-plane-1Transmission of Linear Displacementhttps://mechamechanisms.com/transmission-of-linear-displacement-9<p>One slider is the driver and moves regularly. In general the driven slider moves irregularly.<br>
However there are exceptions.<br>
For example, the video shows a case where the sliders move regularly, transmission ratio is 1. Sliding directions are perpendicular to each other. The assembly enables a position of the mechanism where the gear cranks and the runways create a rectangle.</p>Sat, 28 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-28:transmission-of-linear-displacement-9Internal Spherical Turninghttps://mechamechanisms.com/internal-spherical-turning-2<p>Move the lathe carriage to set initial position: center of internal spherical surface of the work must lay on the axis of the revolution joint between the blue tool post and the green bar.<br>
Turn brown nut to move red tool in circular trajectory.</p>Fri, 27 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-27:internal-spherical-turning-2Linear Translation Without Runwayhttps://mechamechanisms.com/linear-translation-without-runway-1<p>Input: pink gear that makes two blue cranks of two identical planetary mechanisms rotate at the same velocity and direction.<br>
Z2 = 2.Z1<br>
Z2 and Z1 are tooth numbers of grey and green gears, respectively.<br>
Radius of cranks (blue and green) R = 1/2 Pitch diameter of the green gear.<br>
The mechanism is set so as when the blue cranks are vertical, the green cranks are vertical too.<br>
Yellow platform has revolution joints with the green cranks. Center distance of platform joints is equal to center distance of two grey gears.<br>
The platform is translated vertically along an absolute straight line (no need of a runway).<br>
Its stroke length L = 4R.</p>Thu, 26 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-26:linear-translation-without-runway-1Mechanism for Steering a -Wheel Trailer With Small Turning Radiushttps://mechamechanisms.com/mechanism-for-steering-a-4-wheel-trailer-with-small-turning-radius-2<p>An application of simple mechanism that reverses rotation between two shafts instead of a gear drive.<br>
Disadvantage: turning angles of the front wheel set and the rear one are not exactly equal.</p>Wed, 25 Mar 2020 19:41:00 +0100tag:mechamechanisms.com,2020-03-25:mechanism-for-steering-a-4-wheel-trailer-with-small-turning-radius-2Deg. Interrupted Rotationhttps://mechamechanisms.com/360-deg-interrupted-rotation<p>Grey shaft tends to rotate clockwise thanks to a spiral spring located in the blue box (a weight and wire can be used instead of the spring).<br>
Yellow cam controls 360 deg. interrupted rotation of the grey shaft.<br>
The spring that maintains the contact between the cam and green slider is not shown.<br>
Other driving source for the green slider is possible, for example, a pneumatic cylinder.</p>Mon, 23 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-23:360-deg-interrupted-rotationPlanetary Drivehttps://mechamechanisms.com/planetary-drive-1b<p>Pink fixed pulley, yellow satellite big pulley and green carrier create a belt differential planetary drive. Diameter of the yellow big pulley is double to the one of the pink pulley.<br>
Six yellow small pulleys have same diameter. They are connected together by the black belt.<br>
Using chain drive instead of belt one is better.<br>
Input: green carrier rotating regularly.<br>
When the yellow small pulleys reach highest position, their red plates are vertical. When the yellow small pulleys reach lowest position their red plates are horizontal.<br>
The video also shows that after using the worm drive for adjusting the direction of the plates the situation is reversed.</p>Sun, 22 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-22:planetary-drive-1bPart Separationhttps://mechamechanisms.com/part-separation-4b<p>White parts tend to turn blue disk of 4 pins and to go down due to their weight.<br>
Red spring forces pink pawl towards blue ratchet wheel to prevent the disk from rotation.<br>
Once the part A overcomes the blue disk, the latter stops the next part B. The part A goes down and pushes violet lever to pull the pawl from the ratchet wheel to let the disk turn 90 deg. and the part B can go through.</p>Sat, 21 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-21:part-separation-4bStamp Jointhttps://mechamechanisms.com/stamp-joint<p>Insert and turn the brass stamp for fixing it to green handle.<br>
Helical groove on the handle and a pin on the stamp are key factors.</p>Fri, 20 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-20:stamp-jointFriction Cone Variatorhttps://mechamechanisms.com/friction-cone-variator-7<p>Input: the green shaft.<br>
Output: the violet shaft.<br>
Constant velocity joints connects the input shaft or the output shaft and the long hollow cones. Using this joint kind allows the input and output shaft to be parallel.<br>
Move the orange flexible ring for desired output velocity. The moving mechanism is not shown.<br>
The pink rollers are for supporting the cones additionally.</p>Thu, 19 Mar 2020 19:35:00 +0100tag:mechamechanisms.com,2020-03-19:friction-cone-variator-7Interlocking Shaftshttps://mechamechanisms.com/interlocking-shafts-4<p>Only one part can move at a time. The second part is locked due to the engagement of its concave portion with outer surface of the first part.<br>
The mechanism is used in case the concurrent motions can cause damage.<br>
Disadvantage: need to bring the mechanism to initial position for changing the moving shaft.</p>Wed, 18 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-18:interlocking-shafts-4Push-Push Buttonhttps://mechamechanisms.com/push-push-button-1<p>Half of red ball is in circular groove on yellow button, the other half is in internal zigzag groove of grey bush.<br>
Each button push gives one among its two axial positions.<br>
Figure on the right is developed groove of the grey bush.<br>
The button or the bush has assembly structure (not shown) for putting the ball into the grooves.</p>Tue, 17 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-17:push-push-button-1Mechanical NOR Logic Gatehttps://mechamechanisms.com/mechanical-nor-logic-gate<p>Input: blue and green shafts A, B<br>
Output: pink slider C<br>
Yellow spring forces the slider towards the shaft helical cams.<br>
The video shows four logic states alternately:<br>
1. A = 0; B = 0; C = 1<br>
2. A = 1; B = 0; C = 0<br>
3. A = 0; B = 1; C = 0<br>
4. A = 1; B = 1; C = 0</p>Mon, 16 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-16:mechanical-nor-logic-gateLiquid Dispenserhttps://mechamechanisms.com/liquid-dispenser-3<p>Pink continuously rotating cam moves green cylinder to pump out a determined liquid amount during each revolution.<br>
Ball valves are operated automatically thanks to fluid pressure and their own weights. Orange screw is for adjusting liquid amount to be pumped.<br>
Red arrow shows time when the liquid flows out.</p>Sun, 15 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-15:liquid-dispenser-3Watchful Manhttps://mechamechanisms.com/watchful-man<p>This toy is an example to get oscillation around 45 deg. oblique axis from a gravity pendulum.<br>
Thanks to a spherical mechanism (blue shaft and yellow horizontal shaft) the oscillation from yellow pendulum is transferred to blue oblique shaft.<br>
Rotary axis of the blue shaft, axis of blue pin on the blue shaft and rotary axis of the yellow shaft are convergent.<br>
Joint between blue and yellow shafts is of cylinder on plane like in video<br>
/watch?v=aYYJ-x_1nLg</p>Sat, 14 Mar 2020 19:36:00 +0100tag:mechamechanisms.com,2020-03-14:watchful-manChain Drivehttps://mechamechanisms.com/chain-drive-3b<p>The orange sprocket is driving.<br>
The motion of pink crank and disk depends on the ratio of tooth numbers of the two sprockets (8/16) and the chain link number (28).</p>Fri, 13 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-13:chain-drive-3bScrew Expansion Disk Clampinghttps://mechamechanisms.com/screw-expansion-disk-clamping<p>Turn green nut to clamp yellow ring (workpiece) via a couple of pink spring steel expansion disks. Axial pressing the disks increases their outer diameter.<br>
Use two couples for long workpieces.</p>Thu, 12 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-12:screw-expansion-disk-clampingControlling a Disk of Rotational DOFhttps://mechamechanisms.com/controlling-a-disk-of-3-rotational-dof<p>Yellow disk is controlled by three step motors (grounded) via gear drives and a spherical mechanism (axes of all nine revolution joints are concurrent).<br>
By combination of positions of green, beige and violet bars the disk can reach any angular position in 3D space. However, the calculation is not simple.<br>
See a real mechanism:<br>
/watch?v=soWiX1eqZq0<br></p>Wed, 11 Mar 2020 19:36:00 +0100tag:mechamechanisms.com,2020-03-11:controlling-a-disk-of-3-rotational-dofKeeping Direction Unchanged During Rotationhttps://mechamechanisms.com/keeping-direction-unchanged-during-rotation-20<p>Grey cam of eccentric circular goove is immobile.<br>
Its eccentricity and length of green cranks are equal.<br>
Radius of center circle of the cam groove and radius of yellow crank are equal.<br>
When yellow shaft rotates, the direction of the green cranks is unchanged during rotation.<br>
In fact it is a combination of 6 parallelogram mechanisms.<br>
Orange conrods help in overcoming unstable positions when the green and yellow cranks are in line.<br>
Turn cam to adjust the direction.</p>Tue, 10 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-10:keeping-direction-unchanged-during-rotation-20Controlling Rotations of an Objecthttps://mechamechanisms.com/controlling-2-rotations-of-an-object-7<p>The rotations of blue gun of around two intersecting vertical and horizontal axes are controlled by grounded brown motor and violet linear actuators.<br>
Brown motor makes pink shaft and the gun rotate around vertical axis.<br>
Violet linear actuators make yellow bush of inner circular groove move up down thus control the gun rotation around horizontal axis (via sine mechanism).<br>
<br>
Classified list of 2100 videos in channel thang010146 (uploaded till 31 Dec. 2015) including pictures, brief descriptions and YouTube links:<br>
2100 ANIMATED MECHANICAL MECHANISMS</p>Mon, 09 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-09:controlling-2-rotations-of-an-object-7Controlling Linear and Rotary Motions of an Objecthttps://mechamechanisms.com/controlling-linear-and-rotary-motions-of-an-object-2<p>Linear motion of yellow object along longitudinal axis and its rotary motion around vertical axis are controlled by two grounded cranks (in blue and pink). Six pulleys are identical. They are connected together by a closed cable.<br>
Instead of pulleys and cable a chain drive of six sprockets is possible.<br>
When only one crank rotate, the object performs two motions: rotation and translation.<br>
When two cranks rotate in the same direction at the same velocity, the object moves linearly only.<br>
When two cranks rotate in different directions at the same velocity, the object rotates only.</p>Sun, 08 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-08:controlling-linear-and-rotary-motions-of-an-object-2Turning and Telescopic Sliding Doorhttps://mechamechanisms.com/turning-and-telescopic-sliding-door-2a<p>Push yellow panel to open, pull it to close the door.<br>
The yellow panel is fixed to yellow slider that moves along blue runway.<br>
The yellow slider has a pin that moves along a slot of stationary plate (in transparent brown).<br>
At left end of the yellow panel stroke the interaction between yellow rack and the stationary grey gear makes the blue runway, to which blue glass panel is fixed, turn 90 deg.<br>
Green line is the trajectory of the yellow pin center.<br>
For easy motion of the mechanism make the gear as large as possible.</p>Sat, 07 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-07:turning-and-telescopic-sliding-door-2aWedge Mechanismhttps://mechamechanisms.com/wedge-mechanism-29<p>The height of the mechanism can be regulated by blue nut.<br>
Green cylindrical washers allow pink screw change its obliquity.<br>
The weight of upper wedge maintains the contact between two wedges.</p>Fri, 06 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-06:wedge-mechanism-29Centrifugal Clutchhttps://mechamechanisms.com/centrifugal-clutch-2<p>Input: green shaft.<br>
Output: blue shaft.<br>
The brown friction disk has prismatic joint with the blue output shaft.<br>
When velocity of the input shaft increases to prescribed value, because of centrifugal force the yellow arms push orange pins of the pink disk towards the brown friction disk and thus connect the clutch by friction.</p>Thu, 05 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-05:centrifugal-clutch-2Safety Clutch (Friction)https://mechamechanisms.com/safety-clutch-16-friction<p>Under normal condition the violet rod is kept immobile due to friction generated by spring force. The pink bar rocks around a pin of the violet rod. When the slider crashes with the red part, the violet rod moves to the right to prevent damage of other parts.<br>
Repositioning of the violet rod is needed for mechanism restore.</p>Wed, 04 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-04:safety-clutch-16-frictionStraight Line Drawing Mechanismhttps://mechamechanisms.com/straight-line-drawing-mechanism-11<p>AB: pink crank length.<br>
Center distance of the bearings AC = 1.4 AB<br>
BE = 0.2 AB<br>
Point E traces green line, a portion of which is approximately straight.<br>
The straight portion corresponds rotary angle of +/- 12 deg. of the crank.<br>
Distance from A to it: 0.57 AB.<br></p>Tue, 03 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-03:straight-line-drawing-mechanism-11Cutting Curve of Large Radiushttps://mechamechanisms.com/cutting-curve-of-large-radius-1<p>Yellow workpiece is fixed to the conrod at the said portion.<br>
The obtained profile is not absolutely circular.<br>
Angle between two grey runways can be adjusted for various radii of the profile.</p>Mon, 02 Mar 2020 19:42:00 +0100tag:mechamechanisms.com,2020-03-02:cutting-curve-of-large-radius-1Measuring Distance Between Deg. Skew Holeshttps://mechamechanisms.com/measuring-distance-between-90-deg-skew-holes-2<p>Ensure no gap between shafts and holes.<br>
A is distance between the flat portions and the centerline of the orange part. It is determined according to allowed smallest value of the distance to be measured.<br>
Insert two feeler gauges (of equal thickness and as thick as possible) into both gaps between the blue shaft and the flat portions of the orange part to get the value B (feeler gauge thickness).<br>
Measuring result: D = A + B</p>Sun, 01 Mar 2020 19:30:00 +0100tag:mechamechanisms.com,2020-03-01:measuring-distance-between-90-deg-skew-holes-2Eccentric Vibratorhttps://mechamechanisms.com/eccentric-vibrator-2a2<p>Vibrating conveyor.<br>
The blue part vibrates under centrifugal forces created by two shafts carrying eccentrics. Vibration characteristics depend on<br>
- rotation direction and velocity of the shafts,<br>
- angle A between the eccentrics on each shaft<br>
- angle B between the eccentrics between the shafts (set before moving).<br>
For this case there are vibrations in both directions when<br>
- The shafts rotate in opposite directions<br>
- A = 90 deg.<br>
- B = 180 deg.<br>
The green line is locus of a point on the blue part (nearly a slant line).</p>Fri, 28 Feb 2020 19:30:00 +0100tag:mechamechanisms.com,2020-02-28:eccentric-vibrator-2a2Milling Square With Reuleaux Polygonhttps://mechamechanisms.com/milling-square-with-reuleaux-polygonThu, 27 Feb 2020 19:35:00 +0100tag:mechamechanisms.com,2020-02-27:milling-square-with-reuleaux-polygonEqualizing Clamp With Wedgeshttps://mechamechanisms.com/equalizing-clamp-with-wedges<p>Turn orange nut to clamp or release yellow workpiece.<br>
Three wedges help to equalize clamping forces from two pink jaws.<br>
It is used for clamping on uneven surface.</p>Tue, 25 Feb 2020 19:30:00 +0100tag:mechamechanisms.com,2020-02-25:equalizing-clamp-with-wedgesCrimping Toolhttps://mechamechanisms.com/crimping-tool<p>Yellow part and violet disk are jointed with brown part by crimping.<br>
The brown part is fixed to the base.<br>
Transparent disk represents the yellow part before crimping.<br>
Blue shank is fixed to grey spindle.<br>
Green core can move up-down in the shank hole. Blue cross pin acts as a stopper for the core.<br>
When the tool rotates and moves down, four pink jaws bend the yellow part to create the assembly.<br>
The video last scene shows how the tool works supposing that the spindle doesn’t rotate.<br></p>Mon, 24 Feb 2020 19:30:00 +0100tag:mechamechanisms.com,2020-02-24:crimping-toolSatellite Bevel Gearhttps://mechamechanisms.com/satellite-bevel-gear-8-2<p>Green gear is fixed.<br>
Pink gear is idly mounted on yellow crank.<br>
Pink gear axis is not perpendicular to rotary axis of the yellow crank.<br>
Vy = Vb.Zb/(Zb+Zg)<br>
Vp = Vy(Zg/Zp)<br>
Vb, Vy: velocities of blue gear and yellow crank.<br>
Vp: velocity of pink gear around yellow crank.<br>
Zg, Zb, Zp: tooth numbers of green, blue and pink gears respectively.<br>
It is not easy to choose tooth numbers to meet assembly condition for this drive, especially in case of several satellite pink gears arranged symmetrically around the yellow crank.</p>Sat, 22 Feb 2020 19:30:00 +0100tag:mechamechanisms.com,2020-02-22:satellite-bevel-gear-8-2